Materials Literature
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Flame-retarded epoxy composites and phenolic composites containing fiberglass, aramid (Kevlar® 49), and graphite fiber-reinforcements were tested using the NASA upward flame propagation test, the controlled-atmosphere cone calorimeter test, and the liquid oxygen (LOX) mechanical impact test. The upward flame propagati…
Following a prepolymer mixing process, polyurethane (PU) anionomer dispersions were prepared from polyethylene adipate glycol (PEA), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI) and dimethylol propionic acid (DMPA) as a potential ionic centre. Effects of prepolymer molecular weight, PEA molecular w…
The photochemical reduction of CO2 at a TiO2 surface in the presence of H2O has been investigated. CO, CH4, H2, and some higher hydrocarbons CnHm, attributed to C2H6, could be detected as photoproducts by mass spectrometry. No oxidation products of H2O could be found. The temperature dependence of the reaction was inv…
Among many transition-metal oxides, zirconium oxide is found to be active for photocatalytic reduction of carbon dioxide to carbon monoxide with hydrogen in the gas phase.
A novel phase of nickel hydroxide with an average interlayer spacing 5.4–5.6 Å has been synthesized which is neither α nor β type but is an interstratification of both. It ages to the β form in strong alkali. These observations have implications on the dissolution–reprecipitation mechanism suggested for the α→β transf…
A model for predicting the flashover voltage of ice-covered insulators energized with AC voltage is presented in this paper. The model takes into account the variation of ice surface conductivity as a function of freezing water conductivity. The effects of the length of the arc on its own characteristics, as well as t…
Experimental techniques. Part 1 C-Mn weld metals: Manganese and carbon Effects of welding process variables Effects of heat treatment Silicon and impurities Nitrogen and strain ageing. Part 2 Low alloy steel weld metals: Single additions: with varying manganese Elements in combination i?½ Cr-Mo. Part 3 High purity wel…
Rewritable full‐color recording is potentially technologically important but has not yet been realized. A cholesteric low‐molecular‐weight compound (see Figure) is presented that, in the form of a thin film, displays iridescent colors at room temperature (see the cover picture of this issue) that can be recorded and e…
A one-pot reaction of Ni II 1, Co II 2, Fe II 3 and Mn II 4 with 2,2′-bipyridine (bipy) and azide in water leads to [M(bipy)(N 3 ) 2 ] n chains where the metal ion is alternatively bridged by double end-on (EO) and end-to-end (EE) azido bridges; theoretical analysis of the variable-temperature magnetic susceptibility…
The first observation of soft X-ray induced excited spin state trapping has been made for [Fe(phen)2(NCS)2] and [Fe(phen)2(NCSe)2] (phen = 1,10-phenanthroline) at ca. 45 K, analogous to light induced excited spin state trapping but at much higher energy. Soft X-ray photochemistry has also been observed in the high- an…
The Au/HY (4 wt.%) system, prepared by autoreduction of [Au(en)2]3+ in inert gas flow at 423 K, has been studied by TEM, 129Xe NMR and diffuse reflectance infrared spectroscopy of adsorbed CO. 80% of the metallic clusters were in the 1–4 nm size range, and the average linear diameter was found to be 2.6 nm. Some large…
Strontium substituted lanthanum manganites La1–xSrxMnO3 (x=0, 0.1, 0.16, 0.2 and 0.3) have been prepared by a solution combustion process using lanthanum nitrate, strontium nitrate and manganese nitrate as oxidizers and oxalyl dihydrazide as fuel at 300 °C in a pre-heated muffle furnace. As-formed lanthanum manganites…
The structural and ground-state electronic properties of the layered orthorhombic molybdenum trioxide (α-MoO 3 ) have been investigated using a periodic boundary condition ab initio Hartree–Fock method. The effect of electron correlation is estimated with a posteriori density functional corrections to the total energy…
A novel high-voltage cathode material, LiNiVO 4 , with an inverse spinel structure, space group, Fdm (O h 7 ) has been synthesized at temperatures as low as 320 °C using the aqueous glycine–nitrate combustion process. The phase purity of the synthesized product has been found to be excellent as confirmed by X-ray diff…
With reference to the traditional use of Cetraria islandica (Iceland moss) for relief of gastric and duodenal ulcer, plant extracts were screened for in vitro activity against Helicobacter pylori. (+)-Protolichesterinic acid, an aliphatic alpha-methylene-gamma-lactone, was identified as an active component. The MIC ra…
Gries has recently reported [Surf. Interface Anal. 24, 38 (1996)] an atomistic model for inelastic electron scattering relevant to Auger electron spectroscopy and x-ray photoelectron spectroscopy and has derived an equation (designated G1) for the estimation of inelastic mean free paths (IMFPs). We present an analysis…
The voltammetric behaviour of electropolymerized nickel macrocyclic complexes in alkaline aqueous solution is described. The nickel-based modified electrodes were prepared by oxidative polymerization of nickel porphyrin, nickel salen and nickel cyclam complexes by repeated potential scans in 0.1 m NaOH solution. All t…
The electrochemical behavior of 55% Al-Zn coated steel sheet, on which a very thin polymeric film (≈ 1 μm) was applied, was studied using electrochemical impedance spectroscopy (EIS). Use of a straightforward electric model to analyze the spectra obtained with different polymer films allowed correlation of the coating…
The filling of carbon nanotubes with metals and metal oxidesvia one- and two-step processes is presented. Both molten media and wet chemistry solution methods have been used to introduce foreign materials into the hollow nanotube cavities. Chemical reactions inside the tubes have been carried out, including the reduct…
Strongly oxygenated LaMnO3+δperovskites, with nominal MnIV contents up to 58%, have been prepared by thermal decomposition of metal citrates followed by annealings either in air or under high oxygen pressure (200 bar). A high-resolution neutron powder diffraction study of four representative samples with 0.11≤δ≤0.29 r…